Prime Minister David Cameron returned early from vacation to discuss the possibility of military action on Syria in the wake of their alleged use of chemical weapons. Photo: Getty Images

LONDON — The British government said Tuesday its military is drawing up contingency plans for a possible military attack on Syria.

The possible military response would be in reaction to an alleged chemical attack on civilians in Syria.

Prime Minister David Cameron’s office said that the UK is considering a “proportionate” response that would deter Syrian President Bashar Assad from using chemical weapons in the future.

Cameron is facing pressure to recall Parliament later this week to discuss the crisis in Syria. Officials said a decision on whether to bring Parliament back from its summer recess early would be made later Tuesday.

Britain’s Ministry of Defense also said that a planned Royal Air Force training mission involving British Typhoon fighter jets has been postponed. The jets were to have been deployed on the Mediterranean island of Cyprus.